Originally Posted by
RubeRad
You could ride around the neighborhood pushing the button until you find the car -- and then the car is yours!
Be careful. If you push the button too many times it won't work for the car anymore. (They work on "rolling" codes, with the car generally accepting the next X number of codes where X may be ~50.) Once you press the button more than X times, the remote won't work to unlock the car anymore.